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Author Topic: 1997 BMW F650 ST Bluebird - Repair, maintain, ride.  (Read 1223 times)

Offline Hurco550

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Re: 1997 BMW F650 ST Bluebird - Repair, maintain, ride.
« Reply #30 on: Sep 14, 2018, 16:16:59 »
its funny you say that, and I wonder where the "turn" came in design, because my 76 r90/6 BMW is really one of the most well thought out machines to work on that I've ever owned. Now my buddy drives a late model (2010 I think) bmw something or other car, and talk about an overcomplicated piece of kit.
"If you just picked up a drug habbit instead of a kawasaki triple at least you could get high while you waste money"
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1988 tw200, the swamp donkey: http://www.dotheton.com/forum/index.php?topic=75455.0
2006 Suzuki DR650 Adventure monowheel trailer build: http://www.dotheton.com/forum/index.php?topic=75033.0
1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
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Offline Maritime

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Re: 1997 BMW F650 ST Bluebird - Repair, maintain, ride.
« Reply #31 on: Sep 14, 2018, 16:20:44 »
Thank god most times it doesn't break but man when it does it's fucking crazy complex to fix.
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Offline advCo

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Re: 1997 BMW F650 ST Bluebird - Repair, maintain, ride.
« Reply #32 on: Sep 14, 2018, 16:25:51 »
Yeah Mike, its a big single with 2-into-1 cylinder intake and 2 Mikuni BST33's. I know others have fit different carbs (irk's TMs) but not sure whats out there on single carbs.

Regarding the simplicity - the motor is made by Rotax in Austria and the entire bike is built/assembled by Aprilia in Italy. That should say a lot  ;D
« Last Edit: Sep 14, 2018, 16:48:23 by advCo »
"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0 - Sold
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0 - Sold
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0
'97 BMW F650st - http://www.dotheton.com/forum/index.php?topic=75732.0

Offline irk miller

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Re: 1997 BMW F650 ST Bluebird - Repair, maintain, ride.
« Reply #33 on: Sep 14, 2018, 16:35:11 »
SO this is a big single with 2 carbs and 2-1 intake? Can you swap it out to a single carb intake?  That would have to be easier to tune etc? Or maybe not. but one thing I know about German shit, it's usually over complicated when it doesn't need to be.
I have a 2-into-1 intake for these.  Just need a carb to fit the wishbone in the frame.   The intake is off of a DS650 Bombardier.  This Rotax motor is incredibly reliable, very well engineered, and not complex at all.

If you popped the clutch when you pulled the lever, make sure you have the adjustment right.  That's what it does when the lever is in the wrong starting position. 

Offline advCo

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Re: 1997 BMW F650 ST Bluebird - Repair, maintain, ride.
« Reply #34 on: Sep 14, 2018, 16:47:53 »
I have a 2-into-1 intake for these.  Just need a carb to fit the wishbone in the frame.   The intake is off of a DS650 Bombardier.  This Rotax motor is incredibly reliable, very well engineered, and not complex at all.

If you popped the clutch when you pulled the lever, make sure you have the adjustment right.  That's what it does when the lever is in the wrong starting position.

You mean the lever/arm on the LH side cover (where the cable end attaches to?). It may need to be turned another notch.
"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0 - Sold
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0 - Sold
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0
'97 BMW F650st - http://www.dotheton.com/forum/index.php?topic=75732.0

Offline irk miller

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Re: 1997 BMW F650 ST Bluebird - Repair, maintain, ride.
« Reply #35 on: Sep 14, 2018, 16:53:14 »
As you know, since you had to replace it, the clutch actuator is a worm gear.  The actuator shaft (the part that the cable turns) needs to be in the engaged position when the arm and cable is put on so that when you pull the lever it actuates.  Before you put the arm and cable on, you can spin the worm gear completely in both directions all the way to the end of the gear, so it's easy to get confused where it needs to be to hook up the cable.

Offline advCo

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Re: 1997 BMW F650 ST Bluebird - Repair, maintain, ride.
« Reply #36 on: Sep 14, 2018, 17:04:13 »
As you know, since you had to replace it, the clutch actuator is a worm gear.  The actuator shaft (the part that the cable turns) needs to be in the engaged position when the arm and cable is put on so that when you pull the lever it actuates.  Before you put the arm and cable on, you can spin the worm gear completely in both directions all the way to the end of the gear, so it's easy to get confused where it needs to be to hook up the cable.

Yes, I realized that the first two times I put that back together. The clutch seemed to engage/disengage as normal before I attempted it while the bike was running. Now there seems to be some slop between the actuator and the actuator shaft (which doesn't seem right at all). I'll post a video later. I really don't want to drain the coolant and pull the entire cover off again.

Is there a specific position that the shaft needs to be at when the cover is installed? Or is it all just relative to the arm and cable once its all back together?
"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0 - Sold
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0 - Sold
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0
'97 BMW F650st - http://www.dotheton.com/forum/index.php?topic=75732.0

Offline irk miller

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Re: 1997 BMW F650 ST Bluebird - Repair, maintain, ride.
« Reply #37 on: Sep 14, 2018, 17:08:50 »
Don't give up on this thing.  They're super reliable once all sorted.  You just bought into an abused bike.